kvm: svm: Introduce GA Log tracepoint for AVIC

GA Log tracepoint is useful when debugging AVIC performance
issue as it can be used with perf to count the number of times
IOMMU AVIC injects interrupts through the slow-path instead of
directly inject interrupts to the target vcpu.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index c923ad1d7321dc231b56b8092d4701dee3e62e23..7c9ddd680f22f915b917abc7bba9d00c2aaf7769 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1232,6 +1232,7 @@ static int avic_ga_log_notifier(u32 ga_tag)
        u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);
 
        pr_debug("SVM: %s: vm_id=%#x, vcpu_id=%#x\n", __func__, vm_id, vcpu_id);
+       trace_kvm_avic_ga_log(vm_id, vcpu_id);
 
        spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
        hash_for_each_possible(svm_vm_data_hash, kvm_svm, hnode, vm_id) {

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index f5b8814d9f83a806b62aac8787dc7dd95af9f3c3..6c4d9b4caf0704eb53fb1eda2c7d9c08d875d736 100644 (file)
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -1367,6 +1367,24 @@ TRACE_EVENT(kvm_avic_unaccelerated_access,
                  __entry->vec)
 );
 
+TRACE_EVENT(kvm_avic_ga_log,
+           TP_PROTO(u32 vmid, u32 vcpuid),
+           TP_ARGS(vmid, vcpuid),
+
+       TP_STRUCT__entry(
+               __field(u32, vmid)
+               __field(u32, vcpuid)
+       ),
+
+       TP_fast_assign(
+               __entry->vmid = vmid;
+               __entry->vcpuid = vcpuid;
+       ),
+
+       TP_printk("vmid=%u, vcpuid=%u",
+                 __entry->vmid, __entry->vcpuid)
+);
+
 TRACE_EVENT(kvm_hv_timer_state,
                TP_PROTO(unsigned int vcpu_id, unsigned int hv_timer_in_use),
                TP_ARGS(vcpu_id, hv_timer_in_use),

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c67324138e17d029e743d1099e81d8d69f93e1e6..a7cb85231330023a53dc518df8734b28cab27882 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10562,4 +10562,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
+EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_update_request);